<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <link rel="icon" href="D:\A~shcool_study\vue_gittee\bitbug_favicon.ico" type="image/x-icon">
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="./img/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length> 0">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div class="tr" :class="{active :item.isChecked}" v-for="(item, index) in fruitList" :key="item.id">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{item.price}}</div>
            <div class="td">
              <div class="my-input-number">
                <button :disabled="item.num<=1" class="decrease" @click="reduce(item.id)">-</button>
                <span class="my-input__inner">{{item.num}}</span>
                <button class="increase" @click="add(item.id)">+</button>
              </div>
            </div>
            <div class="td">{{item.num*item.price}}</div>
            <div class="td"><button @click="del(item.id)">删除</button></div>
          </div>

          <!-- <div class="tr">
              <div class="td"><input type="checkbox"/></div>
              <div class="td"><img src="./img/荔枝.png" alt="" /></div>
              <div class="td">7</div>
              <div class="td">
                <div class="my-input-number">
                  <button disabled class="decrease"> - </button>
                  <span class="my-input__inner">1</span>
                  <button class="increase"> + </button>
                </div>
              </div>
              <div class="td">14</div>
              <div class="td"><button>删除</button></div>
            </div> -->
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isall" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{total}}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算 ({{jies}}) </button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
  </div>
  <script src="../vue.js"></script>
  <script>
    const defaultArr = [{
      id: 1,
      icon: './img/火龙果.png',
      isChecked: true,
      num: 2,
      price: 6,
    },
    {
      id: 2,
      icon: './img/荔枝.png',
      isChecked: false,
      num: 7,
      price: 20,
    },
    {
      id: 3,
      icon: './img/榴莲.png',
      isChecked: false,
      num: 3,
      price: 40,
    },
    {
      id: 4,
      icon: './img/鸭梨.png',
      isChecked: true,
      num: 10,
      price: 3,
    },
    {
      id: 5,
      icon: './img/樱桃.png',
      isChecked: false,
      num: 20,
      price: 34,
    },]
    const app = new Vue({
      el: '#app',
      data: {
        // 水果列表
        fruitList: JSON.parse(localStorage.getItem('list'))  || defaultArr
      
      },
      computed: {
        //统计选中总价
        total() {
          let list = this.fruitList.filter(item => item.isChecked);
          let results = list.map(item => item.num * item.price);
          return results.reduce((sum, item) => sum + item, 0);
        },
        //统计选中总数
        jies() {
          return this.fruitList.reduce((sum, item) => {
            if (item.isChecked) {
              return sum += item.num
            } else {
              return sum
            }
          }, 0)
        },
        isall: {
          //必须所有小框框选中了，全选框框才会跟着选中-使用every
          get() {
            return this.fruitList.every(item => item.isChecked)
          },
          set(value) {

            this.fruitList.forEach(item => { item.isChecked = value })

          }
        }
      },
      methods: {
        add(id) {
          //1.根据ID 找到数组中的对应项》find
          const fruit = this.fruitList.find(item => item.id === id)
          //2.修改对应项的num
          fruit.num++
        },
        reduce(id) {
          //1.根据ID 找到数组中的对应项》find
          const fruit = this.fruitList.find(item => item.id === id)
          //2.修改对应项的num
          fruit.num--
        },
        del(id) {
          this.fruitList = this.fruitList.filter(item => item.id !== id)
        }
      },
      watch: {
        fruitList: {
          deep: true,
          handler(newvalue) {
            localStorage.setItem('list', JSON.stringify(newvalue))
          }
        }
      }
    })
  </script>
</body>

</html>